Methods of using and screening extended wear ophthalmic lenses

US5776999A · kind A · utility

Assignee

• CIBA Vision Corporation · US

Inventors

• Paul Clement Nicolson · Dunwoody, US
• Richard Carlton Baron · Alpharetta, US
• Peter Chabrecek · Clayton, AU
• John Court · Sydney, AU
• Angelika Domschke · Duluth, US
• Hans Jorg Griesser · Cockatoo, AU
• Arthur Ho · Sydney, AU
• Jens Hopken · Lörrach, DE
• Bronwyn Glenice Laycock · Melbourne, AU
• Qin Liu · Corvallis, US
• Dieter Lohmann · Münchenstein, CH
• Gordon Francis Meijs · Melbourne, AU
• Eric Papaspiliotopoulos · Sydney, AU
• Judy Smith Riffle · Blacksburg, US
• Klaus Schindhelm · Hornsby, AU
• Deborah Sweeney · Chatswood, AU
• Wilson Leonard Terry, Jr. · Gainesville, US
• Jurgen Vogt · Fribourg, CH
• Lynn Cook Winterton · Roswell, US

Key dates

• Filing date: Jul 17, 1996
• Grant date: Jul 7, 1998
• Expiry date: Jul 17, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/937
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An ophthalmic lens screening method suited for extended-wear for periods of at least one day on the eye without a clinically significant amount of corneal swelling and without substantial wearer discomfort. The lens has a balance of oxygen permeability and ion or water permeability, with the ion or water permeability being sufficient to provide good on-eye movement, such that a good tear exchange occurs between the lens and the eye. A preferred lens is a copolymerization product of a oxyperm macromer and an ionoperm monomer. The invention encompasses extended wear contact lenses, which include a core having oxygen transmission and ion transmission pathways extending from the inner surface to the outer surface.